Local Data Port - Siemens MJ-XL Installation And Operation Manual

2
Using the MJ-XL Operator Panel and Controls
2.9

Local Data Port

The Local Data Port on the front panel supports connec-
tion to a PC or other communications device. It transfers
data in either direction: the MJ-X
vide meter and status information to an external device,
and the control program can be configured from an exter-
nal device.
The Local Data Port supports data transmission at stan-
dard data rates from 300 to 19200 baud, inclusive, using
the 2200 communications protocol enhanced with MJ-X
data fields.
The physical interface is a standard 9-pin D-type subminia-
ture connector.
The pinouts match the PC-AT™ RS-232 port connector
(see Table 2.5):
Local Data Port Pinouts
Table 2.4
Signal "DTE" Pin
Description Number(s)
L
MJ-X output
L
MJX Input
Signal Ground
DCD, DSR, CTS ) -- (no connection)
* indicates factory default settings.
Normally, only pins 2, 3, and 5 are needed to communi-
cate through the Data Port.
When using a straight-through cable, the Local Data port
should be jumpered as "DCE" for connection to a termi-
nal device (such as a notebook or laptop computer); and
as "DTE" for connection to a modem. By default, the
Local Data Port is jumpered as DCE.
Figure 2.4 shows the jumper location for the Data Port
connections.
The device used for communications must be configured
to match the following Data Port items in the <COMMU-
NICATIONS> Menu.
• DatPortBaud
• Data Parity
• DataPortAddr - If addressing is on, use the Comm
Addr parameter as the Data Port address.
12
L
Control Panel can pro-
"DCE" Pin
Number(s)*
3 2
2 3
5 5
-- (no connection)
Jumpered for DTE
1
2
3
J23 J22
L
1 1
2 2
3 3
J23 J22
Jumpered for DCE
Data Port Jumper Locations
Figure 2.4
L
The MJ-X rear cover must be removed to access the
jumpers on the main circuit board. See Appendix J for pro-
cedure.
See Appendix J for other jumper locations and default set-
tings.
When repositioning jumpers, use proper Electro-Static
Discharge (ESD) precautions.
wrist strap. If no wrist strap is available, touch a grounded
surface before beginning. (Two accessible ground points
are the screw jacks of the Data Port connector.)
Connecting the Data Port to a Modem
The Local Data Port can be configured for remote commu-
nications via modem. The Data Port Parity must be set for
no parity, the Data Port Addressing function must be
enabled, and a unique Communications Address must be
specified. Using standard modems and cables, the user
can wire one or more MJ-X
tions network. (The MJ-X
"multi-drop" connections; you don' t need an external mul-
tiplexer.)The details of using the MJ-X
a custom communications network are provided in MJ-X
Application Note 005: MJ-X Data Port to MJXplorer Com-
munications via Modem.
Siemens Power Transmission & Distribution, Inc.
1
2
3
If possible, use an ESD
L
devices into a communica-
L
Data Port is designed for
L
Local Data Port for
1 1
2 2
3 3
J23 J22
BT1